/Engine/Plugins/Runtime/nDisplay/Source/SharedMemoryMedia/Public/SharedMemoryMediaCapture.h
It is mostly intended for use in nDisplay render nodes, which are designed to be frame-locked.
[UCLASS](Programming/UnrealArchitecture/Reference/Classes#classdeclaration)(BlueprintType) class USharedMemoryMediaCapture : public [UMediaCapture](API\Plugins\MediaIOCore\UMediaCapture)